/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionHairColor.h
class UMaterialExpressionHairColor : public [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression)
FExpressionInpu...
DyeColor
Control the dyeing color of the hair.
FExpressionInpu...
Melanin
Control the concentration of melanin in hair.
FExpressionInpu...
Redness
Control the redness tint of the hair. Value is normalize over the plausible range of human hair.